Finding the Fourth Proportional to 10,901.31, 16,357.88 and 8,440.94

Step by Step Solution

1. Step 1: Write the proportion equation
   10,901.31 : 16,357.88 = 8,440.94 : x
2. Step 2: Convert to fraction form
   10,901.31/16,357.88 = 8,440.94/x
3. Step 3: Cross multiply
   10,901.31x = 16,357.88 × 8,440.94
4. Step 4: Simplify right side
   10,901.31x = 138,075,883.61
5. Step 5: Solve for x
   x = 138,075,883.61/10,901.31
6. Step 6: Final answer
   x = 12,665.99